From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi2-f4.google.com (mail-oi2-f4.google.com [74.125.231.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D12F1317163 for ; Thu, 20 Aug 2026 22:09:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.196 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787263781; cv=none; b=nAzP7V+8xX74qGa3YMDB2mCuPtVZZ8+xH5vpCAzE1t6NrE3YUj1sUxJWl3JxUqvCjM2RyTCKlpWZJYJImFr6gRsRSCg8hu7wLKdJJvJp8U/T+lYJOMKpaUMWG6VZ2EijdgwkhfsRFjKd6XBd/9TSyg1gDNSsWLolPoC7vb4h2aE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787263781; c=relaxed/simple; bh=gKEl5BDKm7NPtHmYouZILv51lFhr9lX8HXHWK89Ha1I=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=uEkqUAkthWxjgxpOgmROTlVCprtn9g3p/dBh1k/nOImTBcJQKuSx/TWXJ0oh+fJgdGGOG4FpEm4pVQcyqAHH1lkL22kF4yXlNGYhwjFAvkZ9ZFiVd7dyoYtbLZFJm5mMFy8PfQ+Y8G4jzqhq0NnSBE5JFMge4ojJGScwdLscPWk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=74.125.231.196 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi2-f4.google.com with SMTP id 5614622812f47-4ab2d8e7e4cso112545b6e.1 for ; Thu, 20 Aug 2026 15:09:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787263779; x=1787868579; h=content-type:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=aXWG3iaT3vGs1SrxMuVGI6eYYcjA+z2LE04ReofBQBI=; b=k6zAewsGQqSIo4yrIyOPQmLmWOdNtMC0r1nlJ/fmczHIHueWHiHRN845r+hlgZr/4J eo/sNnguO/LCK1Wjwl5BXVJUiXfIMv+gJKJlRvLv8rR2pCFNRRpHs+VLnHIphZFOWi5C dEsgJl1cvR+oZ6l7RKv/W+1V8D0jxlwK9MefbYW4Tqe4bYKywT3UjGg8mMKWeZON/FRb gOOViE9Fd7vOXo2Nwjnd8P9sdGPrSJXyIWrsnt+MPvMrhSDZlD/r3nwNsWsEavoQLvYL DosJMYoBNyufDq6QRAr/F9+8EKdqKEdL55qlqy4hxFHS+K9Lzd+wbHtJznyB6itwnRyy aO6A== X-Forwarded-Encrypted: i=1; AHgh+RrhuMTHt/0lEu3aEES1bIa9FFODSYo/c9o8+WxsYKcnEKrD2xH+vVqpH+1kJU7+wEcV0a2oauBaD3dTzgg=@vger.kernel.org X-Gm-Message-State: AOJu0YzJqdowJ9+ELzLDzqwRWIAV0gl3UkgWmpb2KvnjORX+NQfbI6/v TTy7C2z7ygR+x1PDW/MkfpU4BDWn/oL+QKn8Zg/wtnSa4RRfhAz+U8nkXclWT4agcLtODB7koZb TN1xSmml4CrFLw1hHFYaEMHAb9iK0Ou76QWZiorkORvZrF+1YpRmVJR3FMmI= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:514c:b0:490:315d:e0d5 with SMTP id 5614622812f47-4b2ef42cc98mr1376891b6e.16.1787263778649; Thu, 20 Aug 2026 15:09:38 -0700 (PDT) Date: Thu, 20 Aug 2026 15:09:38 -0700 In-Reply-To: <6a75d605.01d0871a.3a0d52.0047.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a877b22.f7a79266.2f965f.004d.GAE@google.com> Subject: Re: [syzbot] BUG: Address fc00:: on device lo is missing its host route. From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, idosch@nvidia.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, pimyn@google.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 9d2ed026f031 Merge tag 'sysctl-7.03-rc1' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10661e79580000 kernel config: https://syzkaller.appspot.com/x/.config?x=996f19b48f3c7123 dashboard link: https://syzkaller.appspot.com/bug?extid=ded267b328e950a7c0c4 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10d20415580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-9d2ed026.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dbab070bbde5/vmlinux-9d2ed026.xz kernel image: https://storage.googleapis.com/syzbot-assets/857014a70033/bzImage-9d2ed026.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ded267b328e950a7c0c4@syzkaller.appspotmail.com netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 IPv6: BUG: Address fc00:: on device lo is missing its host route. netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 bridge_slave_1: left allmulticast mode bridge_slave_1: left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state bridge_slave_0: left allmulticast mode bridge_slave_0: left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): Released all slaves hsr_slave_0: left promiscuous mode hsr_slave_1: left promiscuous mode batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 veth1_macvtap: left promiscuous mode veth0_macvtap: left promiscuous mode veth1_vlan: left promiscuous mode veth0_vlan: left promiscuous mode team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.